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post #131 of 140 (permalink) Old 09-10-2019, 04:09 PM
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Quote: Originally Posted by tijgert View Post
Why would you try 7??? You need 3 total so either replace it with 3 or tack 8 on top. There is no use for 7.

My concern is whether 7 mohm is too low to tack on top and would trigger the safety mode.

By using 7 mohm, you would get 1.714 x 260W = 445W PL (FE Card)
By using 8 mohm, you would get 1.625 x 260W = 422W PL (FE Card)

Using the 8 mohm is already confirmed, just wondering how much further we could push the easy method of tacking instead of going with the rip and replace 3 mohm.

Edit - would these be the correct sku for each application?

8 mohm - ERJ-M1WSF8M0U (RTX Tack-on)
7 mohm - ERJ-M1WSF7M0U (RTX Tack-on)
5 mohm - ERJ-M1WSF5M0U (Titan Xp Tack-on)
3 mohm - ERJ-M1WSF3M0U (Titan Xp / RTX Rip n Replace)

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Last edited by chibi; 09-10-2019 at 04:13 PM.
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post #132 of 140 (permalink) Old 09-10-2019, 05:13 PM
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Do not use 7, you need 3 total and tacking on 8 will give you just 3. Tacking on 7 will get you a total of below 3 and that triggers safety mode. Do not try it.

So much hardware left to destroy, 'accidentally'...

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post #133 of 140 (permalink) Old 09-10-2019, 05:16 PM - Thread Starter
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Quote: Originally Posted by tijgert View Post
Do not use 7, you need 3 total and tacking on 8 will give you just 3. Tacking on 7 will get you a total of below 3 and that triggers safety mode. Do not try it.
Have you ever seen anyone test this? 7 will give you very nearly 3 mOhms, 2.917. I bet using 7 would work... I really wish I tested it first. If/when I change the paste on my GPU I will switch to 7 mOhm shunts just to test it.
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post #134 of 140 (permalink) Old 09-10-2019, 06:14 PM
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7 is s weird value for a resistor. Resistors are made in specific ranges, I think the mOhm are simply rounded to whole numbers.

Even only putting lower current sensing resistors on the power cable inputs alone will give you a gigantic boost in power limit. 5 mOhm vs 3.08 mOhm. Over 60% boost is more than enough and if you need more then you're probably better off soldering on a new power delivery altogether.

Weren't there reports even with 3.08 or 3.0 already occasionally causing low clocks?
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post #135 of 140 (permalink) Old 09-11-2019, 04:43 AM
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I will gladly take that bet. It’s been done, it didn’t work.

So much hardware left to destroy, 'accidentally'...

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post #136 of 140 (permalink) Old 09-11-2019, 09:49 AM
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Quote: Originally Posted by JackCY View Post
Weren't there reports even with 3.08 or 3.0 already occasionally causing low clocks?

Interesting, where was these results reported?

Quote: Originally Posted by tijgert View Post
I will gladly take that bet. It’s been done, it didn’t work.

Good to know I'll take the 7 mohm resistors out of my cart, would you be able to provide the source as well? Thank you

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post #137 of 140 (permalink) Old 09-11-2019, 12:20 PM
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Quote: Originally Posted by chibi View Post
Interesting, where was these results reported?

Good to know I'll take the 7 mohm resistors out of my cart, would you be able to provide the source as well? Thank you
I seem to recollect that it was in a thread here, maybe even this thread. Mr.Fox maybe?
He did all the tests and calcumalations, had nice pics too, and he discovered that lowering the resistance to below 3 mOhm would put the card in safe mode, no matter what he did.

1 / (1/5 + 1/8 ) = 3.07 mOhm, the absolute minimum you can get and still have it work.

He did all the testing for you so you wouldn't have to. But I am not too proud to say I told you so, so go right ahead
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post #138 of 140 (permalink) Old 09-11-2019, 02:45 PM
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The cards have multiple modes and transitions during their operation, so you don't want to be riding the edge and then have it go to weird clocks at certain times or do it sporadically.
The lowest usable value used to be 2.5 mOhm for Paxwell/Maxwel? Now with Turing it's 3 mOhm.

If you want to "remove it" entirely then it's a more complicated thing to do where you could short the power pins or use a very low resistance but report what ever you want onto the sensing pins, meaning you could limit it such that it always stays within the stock power budget values. Too much hassle to bother really and you can't simply lock it to a single value I believe as that also makes it go to a "safe mode" when it's reading high power draw on idle for example. So you need a "smart" system/circuit that does the limiting: min(read_value, my_max), don't know if this can be done somehow simply with a basic circuit.

8 mOhm should work, or you can use a 10 mOhm, both raise the power limit a lot and are easy to buy.
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post #139 of 140 (permalink) Old 09-12-2019, 06:15 PM - Thread Starter
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Quote: Originally Posted by tijgert View Post
I seem to recollect that it was in a thread here, maybe even this thread. Mr.Fox maybe?
That was using another 5 mOhm resistor on top, not 7 mOhm.

I have only seen 2.5 mOhm, 3 mOhm, and 3.08 mOhm resistor values tested by anyone. We have no idea if 2.917 mOhms is too low. I suspect it is not because 2.5 mOhms worked for me with some workloads, like Firestrike Extreme. I think 2.5 mOhms is only barely too low.

Quote: Originally Posted by JackCY View Post
8 mOhm should work, or you can use a 10 mOhm, both raise the power limit a lot and are easy to buy.
Going up to 10 mOhms lowers the increase in the power limit a good amount, 50% more power instead of 62.5% with 8 or 71.4% with 7.
Where I sourced them everything was easy to buy, in ~1 mOhm steps from 1 to 20+ mOhm. 3s, 5s, 6s, 7s, 8s, 10s, 12s, or whatever you wanted for about a dollar each.
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post #140 of 140 (permalink) Old 09-13-2019, 09:37 AM
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I ended up getting a set of 5 mohm for my current Titan Xp, and a set of 3 & 8 mohm if I decide to upgrade soon.

I had purchased a set of 5 mohm in the past, but the parts are so small I forgot where I put them, lol.

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GSkill Trident Z - 16GB
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Cooling
EK-CoolStream PE 360
Case
Lian Li PC-O11
Monitor
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